How to Increase the Space Between Grouped Bars in Ggplot2

How to increase the space between grouped bars in ggplot2?

What's about?
1. Use geom_col instead of geom_bar as recommended.
2. specify suitable position_dodge(0.5) and width=0.5 and 3. remove unnecessary code.

ggplot(d, aes(x=Measure, y=mean, fill=Condition)) + 
  geom_col(colour="black",width=0.5,    
           position=position_dodge(0.5)) +
  geom_errorbar(aes(ymin=mean-se, ymax=mean+se),
                position=position_dodge(0.5), width=.25)+
  scale_x_discrete(limits = c("Interest", "Value","Effort","Difficulty","Competence","JOL")) +
  scale_y_continuous(breaks=seq(0,7,by =1),limits = c(0,7), expand = c(0,0))+
  scale_fill_manual(values=c("#ffcc00ff","#ffffff"), name = "Condition") + 
  labs(x="", y = "Rating (0-7)")+
  theme_minimal() +
  theme(axis.line = element_line(color="black"),
        axis.ticks = element_line(color="black"),
        panel.border = element_blank())

Adjusting distance between groups of bars in ggplot2

I think this is easiest to achieve if you use x = Time and fill = Group. Something like:

dodge <- position_dodge(width = 0.5)
ggplot(df, aes(x = Time, y = mean, fill = Group)) +  
  geom_bar(width = 0.5, stat="identity", position = dodge) +  
  geom_errorbar(aes(ymin=mean-sd, ymax=mean+sd),
                position = dodge, size = 1, shape = 1, width = 0.2) +  
  scale_fill_manual(values = c("#333333", "#FF0000", "#0000FF")) +
  theme_bw() +
  theme(panel.grid.major = element_blank())

Increase space between bars in ggplot

You can adjust the width outside of the position_dodge as well (in geom_bar),

ggplot(data=df, aes(x=Gene, y=FC, fill=expt, group=expt)) +
  geom_bar(colour="black", stat="identity", position = position_dodge(width = 0.8), width=0.5) +
  geom_errorbar(aes(ymax = FC + se, ymin = FC, group=expt),
                position = position_dodge(width = 0.8), width = 0.25)

or

dodge <- position_dodge(width = 0.5)

ggplot(data=df, aes(x=Gene, y=FC, fill=expt, group=expt)) +
  geom_bar(colour="black", stat="identity", position=dodge, width=0.5) +
  geom_errorbar(aes(ymax = FC + se, ymin = FC, group=expt),
                position = dodge, width = 0.25)

Adding space between bars in ggplot2

Is this what you want?

hist + geom_bar(width=0.4, position = position_dodge(width=0.5))

• width in geom_bar determines the width of the bar.
• width in position_dodge determines the position of each bar.

Probably you can easily understand their behavior after you play with them for a while.

ggplot2 : How to reduce the width AND the space between bars with geom_bar

I would adjust the plot's aspect ratio, and have ggplot automatically assign the right width for the bars and the gap between them:

  ggplot(iris, aes(Species, Petal.Length)) + 
      geom_bar(stat="summary", width=0.4) +
      theme(aspect.ratio = 2/1)

Produces this:

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